Chateau N, Baude D
ESSILOR Optique de Contact, Créteil, France.
Optom Vis Sci. 1997 Jul;74(7):532-9. doi: 10.1097/00006324-199707000-00022.
A model of the presbyopic eye in various viewing conditions is derived as a combination of average clinical data with a monochromatic eye model. The modulation transfer function (MTF), obtained through Fourier optics calculations, is used to define new metrics, which help to predict the visual performance of multifocal contact lenses. The model is applied to the optimization of concentric bifocal contact lenses (BCLs): the optimal center optimal zone diameter (COZD) is determined as a function of the lens addition and decentration, in order to achieve similar average performance in distance and near vision. Calculations predict a decrease of the overall visual performance of optimized bifocal lenses with increasing addition. They also show that a lens shift relative to the pupil has opposite effects on the performance of center near (CN) and center distance (CD) designs. The comparison between these two types of bifocals suggests that better overall performance is obtained when the near correction is supported by the center optical zone. These theoretical predictions are found to be compatible with anterior clinical results obtained with BCLs.
通过将平均临床数据与单色眼模型相结合，得出了不同观看条件下老视眼的模型。通过傅里叶光学计算获得的调制传递函数（MTF）用于定义新的指标，这些指标有助于预测多焦点隐形眼镜的视觉性能。该模型应用于同心双焦点隐形眼镜（BCL）的优化：确定最佳中心最佳区域直径（COZD）作为镜片加光度和偏心的函数，以便在远视力和近视力方面实现相似的平均性能。计算预测，随着加光度增加，优化后的双焦点镜片的整体视觉性能会下降。计算还表明，镜片相对于瞳孔的移动对中心近用（CN）和中心远用（CD）设计的性能有相反的影响。这两种双焦点镜片的比较表明，当近用矫正由中心光学区支持时，可获得更好的整体性能。发现这些理论预测与使用BCL获得的前期临床结果相符。
